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/*
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* strtoull.c --
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*
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* Source code for the "strtoull" library procedure.
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*
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* Copyright (c) 1988 The Regents of the University of California.
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* Copyright (c) 1994 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: strtoull.c,v 1.5 2002/02/24 02:53:25 dgp Exp $
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*/
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#include "tcl.h"
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#include "tclPort.h"
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#include <ctype.h>
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/*
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* The table below is used to convert from ASCII digits to a
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* numerical equivalent. It maps from '0' through 'z' to integers
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* (100 for non-digit characters).
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*/
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static char cvtIn[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, /* '0' - '9' */
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100, 100, 100, 100, 100, 100, 100, /* punctuation */
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19, /* 'A' - 'Z' */
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20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
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30, 31, 32, 33, 34, 35,
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100, 100, 100, 100, 100, 100, /* punctuation */
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19, /* 'a' - 'z' */
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20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
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30, 31, 32, 33, 34, 35};
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/*
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*----------------------------------------------------------------------
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*
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* strtoull --
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*
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* Convert an ASCII string into an integer.
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*
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* Results:
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* The return value is the integer equivalent of string. If endPtr
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* is non-NULL, then *endPtr is filled in with the character
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* after the last one that was part of the integer. If string
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* doesn't contain a valid integer value, then zero is returned
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* and *endPtr is set to string.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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#if TCL_WIDE_INT_IS_LONG
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unsigned long long
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#else
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Tcl_WideUInt
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#endif
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strtoull(string, endPtr, base)
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CONST char *string; /* String of ASCII digits, possibly
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* preceded by white space. For bases
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* greater than 10, either lower- or
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* upper-case digits may be used.
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*/
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char **endPtr; /* Where to store address of terminating
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* character, or NULL. */
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int base; /* Base for conversion. Must be less
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* than 37. If 0, then the base is chosen
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* from the leading characters of string:
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* "0x" means hex, "0" means octal, anything
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* else means decimal.
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*/
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{
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register CONST char *p;
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register Tcl_WideUInt result = 0;
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register unsigned digit;
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register Tcl_WideUInt shifted;
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int anyDigits = 0, negative = 0;
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/*
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* Skip any leading blanks.
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*/
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p = string;
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while (isspace(UCHAR(*p))) { /* INTL: locale-dependent */
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p += 1;
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}
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/*
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* Check for a sign.
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*/
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if (*p == '-') {
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p += 1;
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negative = 1;
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} else {
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if (*p == '+') {
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p += 1;
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}
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}
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/*
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* If no base was provided, pick one from the leading characters
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* of the string.
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*/
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if (base == 0) {
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if (*p == '0') {
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p += 1;
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if (*p == 'x' || *p == 'X') {
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p += 1;
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base = 16;
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} else {
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/*
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* Must set anyDigits here, otherwise "0" produces a
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* "no digits" error.
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*/
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anyDigits = 1;
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base = 8;
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}
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} else {
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base = 10;
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}
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} else if (base == 16) {
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/*
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* Skip a leading "0x" from hex numbers.
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*/
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if ((p[0] == '0') && (p[1] == 'x' || *p == 'X')) {
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p += 2;
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}
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}
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/*
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* Sorry this code is so messy, but speed seems important. Do
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* different things for base 8, 10, 16, and other.
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*/
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if (base == 8) {
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for ( ; ; p += 1) {
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147 |
digit = *p - '0';
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if (digit > 7) {
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break;
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150 |
}
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shifted = result << 3;
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152 |
if ((shifted >> 3) != result) {
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goto overflow;
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154 |
}
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155 |
result = shifted + digit;
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156 |
if ( result < shifted ) {
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157 |
goto overflow;
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158 |
}
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159 |
anyDigits = 1;
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160 |
}
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161 |
} else if (base == 10) {
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162 |
for ( ; ; p += 1) {
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163 |
digit = *p - '0';
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164 |
if (digit > 9) {
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165 |
break;
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166 |
}
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167 |
shifted = 10 * result;
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168 |
if ((shifted / 10) != result) {
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169 |
goto overflow;
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170 |
}
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171 |
result = shifted + digit;
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172 |
if ( result < shifted ) {
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173 |
goto overflow;
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174 |
}
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175 |
anyDigits = 1;
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176 |
}
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177 |
} else if (base == 16) {
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178 |
for ( ; ; p += 1) {
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179 |
digit = *p - '0';
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180 |
if (digit > ('z' - '0')) {
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181 |
break;
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182 |
}
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183 |
digit = cvtIn[digit];
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184 |
if (digit > 15) {
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185 |
break;
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186 |
}
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187 |
shifted = result << 4;
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188 |
if ((shifted >> 4) != result) {
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189 |
goto overflow;
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190 |
}
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191 |
result = shifted + digit;
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sl@0
|
192 |
if ( result < shifted ) {
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193 |
goto overflow;
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194 |
}
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195 |
anyDigits = 1;
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196 |
}
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sl@0
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197 |
} else if ( base >= 2 && base <= 36 ) {
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198 |
for ( ; ; p += 1) {
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199 |
digit = *p - '0';
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200 |
if (digit > ('z' - '0')) {
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sl@0
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201 |
break;
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202 |
}
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203 |
digit = cvtIn[digit];
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204 |
if (digit >= (unsigned) base) {
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205 |
break;
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sl@0
|
206 |
}
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207 |
shifted = result * base;
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208 |
if ((shifted/base) != result) {
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209 |
goto overflow;
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210 |
}
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sl@0
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211 |
result = shifted + digit;
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212 |
if ( result < shifted ) {
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sl@0
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213 |
goto overflow;
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214 |
}
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sl@0
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215 |
anyDigits = 1;
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|
216 |
}
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|
217 |
}
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sl@0
|
218 |
|
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sl@0
|
219 |
/*
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220 |
* Negate if we found a '-' earlier.
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221 |
*/
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sl@0
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222 |
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sl@0
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223 |
if (negative) {
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224 |
result = (Tcl_WideUInt)(-((Tcl_WideInt)result));
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|
225 |
}
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sl@0
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226 |
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sl@0
|
227 |
/*
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228 |
* See if there were any digits at all.
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|
229 |
*/
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sl@0
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230 |
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sl@0
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231 |
if (!anyDigits) {
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sl@0
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232 |
p = string;
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233 |
}
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sl@0
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234 |
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sl@0
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235 |
if (endPtr != 0) {
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sl@0
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236 |
*endPtr = (char *) p;
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237 |
}
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sl@0
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238 |
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239 |
return result;
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sl@0
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240 |
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sl@0
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241 |
/*
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sl@0
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242 |
* On overflow generate the right output
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sl@0
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243 |
*/
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sl@0
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244 |
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sl@0
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245 |
overflow:
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246 |
errno = ERANGE;
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sl@0
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247 |
if (endPtr != 0) {
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sl@0
|
248 |
for ( ; ; p += 1) {
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sl@0
|
249 |
digit = *p - '0';
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sl@0
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250 |
if (digit > ('z' - '0')) {
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sl@0
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251 |
break;
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sl@0
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252 |
}
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sl@0
|
253 |
digit = cvtIn[digit];
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sl@0
|
254 |
if (digit >= (unsigned) base) {
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sl@0
|
255 |
break;
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sl@0
|
256 |
}
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sl@0
|
257 |
}
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sl@0
|
258 |
*endPtr = (char *) p;
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sl@0
|
259 |
}
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sl@0
|
260 |
return (Tcl_WideUInt)Tcl_LongAsWide(-1);
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|
sl@0
|
261 |
}
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